So here is my honest thoughts:
1. My favorite is Sakiko (I had to go back and make sure of her name. I am terrible at remember Japanese names), and I didn't really like Yoko. (I hope it's her name.)
2. She looks cold, but she is sweetheart inside. I like the way she is. Yeap.
3. I find her lame actually, she keep being rude and mostly passive aggressive. She barks, but she don't bite. She is trying to act like a savage, but she is actually not.
4. Well, she is a sharp character in some ways, but not too sharp. I like the logical part of her.
5. Inner voice of Suki parts could be less I guess, You didn't really mentioned stories of that four girls, but probably you will in the full version. I hope they would be interesting as Bowie and Adolf. :3
6. yes!
7. I liked the game, really. But I will be having hard time while playing it, because of the japanese names and their extras (-san, -senpai, -kun, ect...) . No offence please. ;-;
9. Yes, why not.
10. There will be a ending with Kazashi too, rigt? There must be! And I feel irresistible desire and curiosity to know about her inner world. I assume she will be deep and sorrowful.